Doesn't want to start when hot

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Doesn't want to start when hot

Postby burnzdog » 20 Jun 2018, 21:32

Hi all,

Just had a new engine put in 2.1 DJ all going well until I stopped at a garage for fuel and it didn't want to start again. It turns over but feels like battery is dead. When cold it fires up no problem first time.

Any ideas where to look?
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Re: Doesn't want to start when hot

Postby silverbullet » 21 Jun 2018, 06:05

I would ask in the Technical sub-forums ;)

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Re: Doesn't want to start when hot

Postby Mocki » 21 Jun 2018, 06:18

first thing to look at is the earth straps, gearbox nose and battery
then consider the positive connections onto the starter and battery , dirty loose connections show up when its hot

if all of those check out ok, the ollite bushing in the bell housing is the next place to look.

all this is assuming you have not altered the timing , as too far advanced timing also shows these symptoms , but timing does not move on its own
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Re: Doesn't want to start when hot

Postby 937carrera » 21 Jun 2018, 19:38

Got almost exactly the same symptoms on another car today. Spins over normally & starts fine when cold, almost doesn't turn over when hot.

Best diagnosis at this point is it's the integral +ve cable from the solenoid to the starter motor that is corroded & breaking down when hot - all the above suggestions are worth checking
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Re: Doesn't want to start when hot

Postby burnzdog » 22 Jun 2018, 15:29

Thanks for suggestions.

Where/ how exactly do I check the integral +ve cable from the solenoid to the starter motor?

The cables to the starter motor seem very awkward to get to. Do I need to take the motor off

It is strange it fire up straight away no problem when cool, just after a run it sounds like battery is dead.
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Re: Doesn't want to start when hot

Postby 937carrera » 22 Jun 2018, 15:49

To do that you'll need to remove the starter, separate the solenoid, and remove the internals of the motor to inspect / test.

It may sound strange, but remember resistance increases with temperature, so a marginal +ve lead becomes non functional due to conducted heat from the engine or repeated cranking. That could be another method to diagnose, pull the coil > dizzy lead and try turning the engine over a few times. That will put heat into the +ve cable without getting the engine warm, but be careful, you can burn out a good starter by holding it on too long.

"Kwik Fit" approach would be to simply replace starter.

Don't forget to check the earths and other connections as suggested - easy / cheap stuff first.

It's starter off to check the oilite bearing anyway, and it's easier access on a WBX than air cooled.

On the other hand you say you've just had a new DJ engine put in. I'd be tempted to take it back to the garage that fitted it, where did the starter come from ?
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Re: Doesn't want to start when hot

Postby burnzdog » 22 Jun 2018, 16:09

Ok. It's worth mentioning I literally just had a new engine put in. And the problem didn't exist before. Also I had a problem the other day where it would take start at all and I found there was a cable loose from the starter motor, which I could just about reconnect with dislocating my wrist.
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Re: Doesn't want to start when hot

Postby 937carrera » 22 Jun 2018, 16:16

Well, I think that's a big clue.

Either, remove the battery earth and remove / replace starter cables, make sure they are clean, and tighten up with tools, or simply take it back to the garage to allow them to finish the job off. Ask them to confirm that you have the same starter motor fitted as well
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Re: Doesn't want to start when hot

Postby burnzdog » 22 Jun 2018, 16:21

It's is the same starter motor. I had a similar issue with my bay and it was resolved I think by adjusting distributor. I will take back to garage as well.
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